TV tattoo artist Kat Von D is adamant her romance with Motley Crue rocker Nikki Sixx is back on again - two months after they announced their split.The musician began dating the reality show star in 2007, following Von D's divorce from fellow tattooist Oliver Peck. The couple went their separate ways in January (10), with Sixx releasing a statement to confirm the end of the love affair. Von D was recently rumoured to have landed a new boyfriend after she was photographed with Bam Margera, but she has taken to the internet to dismiss reports she's dating the Jackass star - insisting she is still involved with Sixx. In a post on her Twitter.com page, Von D writes, "So annoyed! Contrary to silly rumours, Bam Margera and I are NOT dating. I'm currently in a relationship with Nikki. Hope that clears things up."